scowl vs glower

scowl and glower both are nouns.

Word	Noun	Adjective	Verb	Adverb
scowl	Yes	No	Yes	No
glower	Yes	No	Yes	No

As verbs, glower is a hypernym of scowl; that is, glower is a word with a broader meaning than scowl:

scowl: frown with displeasure
glower: look angry or sullen, wrinkle one's forehead, as if to signal disapproval

Other hypernyms of scowl include frown, lour, lower.

scowl (noun)	glower (noun)
a facial expression of dislike or displeasure	an angry stare

scowl (verb)	glower (verb)
frown with displeasure	look angry or sullen, wrinkle one's forehead, as if to signal disapproval
	look at with a fixed gaze